162 lines
4.6 KiB
Rust
162 lines
4.6 KiB
Rust
// NB: transitionary, de-mode-ing.
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#[forbid(deprecated_mode)];
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#[forbid(deprecated_pattern)];
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//! Operations and constants for `f32`
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pub use cmath::c_float::*;
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pub use cmath::c_float_targ_consts::*;
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// These are not defined inside consts:: for consistency with
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// the integer types
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pub const NaN: f32 = 0.0_f32/0.0_f32;
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pub const infinity: f32 = 1.0_f32/0.0_f32;
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pub const neg_infinity: f32 = -1.0_f32/0.0_f32;
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pub pure fn is_NaN(f: f32) -> bool { f != f }
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pub pure fn add(x: f32, y: f32) -> f32 { return x + y; }
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pub pure fn sub(x: f32, y: f32) -> f32 { return x - y; }
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pub pure fn mul(x: f32, y: f32) -> f32 { return x * y; }
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pub pure fn div(x: f32, y: f32) -> f32 { return x / y; }
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pub pure fn rem(x: f32, y: f32) -> f32 { return x % y; }
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pub pure fn lt(x: f32, y: f32) -> bool { return x < y; }
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pub pure fn le(x: f32, y: f32) -> bool { return x <= y; }
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pub pure fn eq(x: f32, y: f32) -> bool { return x == y; }
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pub pure fn ne(x: f32, y: f32) -> bool { return x != y; }
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pub pure fn ge(x: f32, y: f32) -> bool { return x >= y; }
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pub pure fn gt(x: f32, y: f32) -> bool { return x > y; }
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// FIXME (#1999): replace the predicates below with llvm intrinsics or
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// calls to the libmath macros in the rust runtime for performance.
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/// Returns true if `x` is a positive number, including +0.0f320 and +Infinity
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pub pure fn is_positive(x: f32) -> bool
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{ return x > 0.0f32 || (1.0f32/x) == infinity; }
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/// Returns true if `x` is a negative number, including -0.0f320 and -Infinity
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pub pure fn is_negative(x: f32) -> bool
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{ return x < 0.0f32 || (1.0f32/x) == neg_infinity; }
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/**
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* Returns true if `x` is a negative number, including -0.0f320 and -Infinity
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*
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* This is the same as `f32::is_negative`.
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*/
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pub pure fn is_nonpositive(x: f32) -> bool {
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return x < 0.0f32 || (1.0f32/x) == neg_infinity;
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}
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/**
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* Returns true if `x` is a positive number, including +0.0f320 and +Infinity
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*
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* This is the same as `f32::is_positive`.)
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*/
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pub pure fn is_nonnegative(x: f32) -> bool {
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return x > 0.0f32 || (1.0f32/x) == infinity;
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}
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/// Returns true if `x` is a zero number (positive or negative zero)
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pub pure fn is_zero(x: f32) -> bool {
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return x == 0.0f32 || x == -0.0f32;
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}
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/// Returns true if `x`is an infinite number
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pub pure fn is_infinite(x: f32) -> bool {
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return x == infinity || x == neg_infinity;
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}
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/// Returns true if `x`is a finite number
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pub pure fn is_finite(x: f32) -> bool {
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return !(is_NaN(x) || is_infinite(x));
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}
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// FIXME (#1999): add is_normal, is_subnormal, and fpclassify.
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/* Module: consts */
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pub mod consts {
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// FIXME (requires Issue #1433 to fix): replace with mathematical
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// constants from cmath.
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/// Archimedes' constant
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pub const pi: f32 = 3.14159265358979323846264338327950288_f32;
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/// pi/2.0
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pub const frac_pi_2: f32 = 1.57079632679489661923132169163975144_f32;
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/// pi/4.0
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pub const frac_pi_4: f32 = 0.785398163397448309615660845819875721_f32;
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/// 1.0/pi
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pub const frac_1_pi: f32 = 0.318309886183790671537767526745028724_f32;
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/// 2.0/pi
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pub const frac_2_pi: f32 = 0.636619772367581343075535053490057448_f32;
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/// 2.0/sqrt(pi)
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pub const frac_2_sqrtpi: f32 = 1.12837916709551257389615890312154517_f32;
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/// sqrt(2.0)
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pub const sqrt2: f32 = 1.41421356237309504880168872420969808_f32;
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/// 1.0/sqrt(2.0)
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pub const frac_1_sqrt2: f32 = 0.707106781186547524400844362104849039_f32;
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/// Euler's number
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pub const e: f32 = 2.71828182845904523536028747135266250_f32;
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/// log2(e)
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pub const log2_e: f32 = 1.44269504088896340735992468100189214_f32;
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/// log10(e)
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pub const log10_e: f32 = 0.434294481903251827651128918916605082_f32;
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/// ln(2.0)
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pub const ln_2: f32 = 0.693147180559945309417232121458176568_f32;
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/// ln(10.0)
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pub const ln_10: f32 = 2.30258509299404568401799145468436421_f32;
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}
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pub pure fn signbit(x: f32) -> int {
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if is_negative(x) { return 1; } else { return 0; }
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}
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pub pure fn logarithm(n: f32, b: f32) -> f32 {
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return log2(n) / log2(b);
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}
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impl f32: num::Num {
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pure fn add(other: &f32) -> f32 { return self + *other; }
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pure fn sub(other: &f32) -> f32 { return self - *other; }
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pure fn mul(other: &f32) -> f32 { return self * *other; }
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pure fn div(other: &f32) -> f32 { return self / *other; }
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pure fn modulo(other: &f32) -> f32 { return self % *other; }
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pure fn neg() -> f32 { return -self; }
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pure fn to_int() -> int { return self as int; }
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static pure fn from_int(n: int) -> f32 { return n as f32; }
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}
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//
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// Local Variables:
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// mode: rust
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// fill-column: 78;
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// indent-tabs-mode: nil
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// c-basic-offset: 4
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// buffer-file-coding-system: utf-8-unix
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// End:
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//
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